1. Graduate School of Pharmaceutical Sciences The University of Tokyo 7-3-1 Hongo, Bunkyo-ku Tokyo 113-0033 Japan
2. Collaborative Research Institute for Innovative Microbiology The University of Tokyo 1-1-1 Yayoi, Bunkyo-ku Tokyo 113-8657 Japan
3. PRESTO Japan Science and Technology Agency 4-1-8, Honcho, Kawaguchi Saitama 332-0012 Japan